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(4) The three and twelve months ended December 31, 2013, includes $7.8 million and $10.5 million, respectively, of expenses for financing the acquisition. In addition, both periods include $1.1 million of expense for the write-off of deferred financing costs.

(5) Includes $166.0 million of income tax benefits from the reversal of the reserves for unrecognized tax benefits from alternative energy tax credits. The IRS completed its audit of PCA's 2008 and 2009 Federal income tax returns and all claimed alternative energy tax credits were allowed. As a result, a $103.9 million reserve for the Filer City mill’s cellulosic biofuel tax credit was fully reversed. In addition, an IRS Chief Counsel Memorandum was published in the fourth quarter and resulted in the reversal of $62.1 million of reserves related to the taxability of the alternative fuel mixture tax credits acquired in the acquisition of Boise.

(6) Includes $10.9 million of non-cash pension curtailment charges related to pension plan changes in which certain hourly corrugated and containerboard mill employees will transition from a defined benefit pension plan to a defined contribution (401k) plan.

(7) Includes income of $3.4 million from state income tax adjustments.

(8) In the first quarter of 2012, the company amended its 2009 tax return to reduce the gallons claimed as cellulosic biofuel producer credits previously recorded as a tax benefit, and increase the gallons claimed for alternative fuel mixture credits previously recorded as income. The increase in gallons claimed as alternative fuel mixture credits resulted in income of $95.5 million, and the decrease in gallons claimed as cellulosic biofuel producer credits resulted in a decrease in tax benefits of $118.5 million, or a net charge of $23.0 million.

(1) On October 25, 2013, we acquired Boise Inc. (Boise). The 2013 consolidated earnings results include Boise for the period of October 25 through December 31, 2013.

(2) Prior to the acquisition of Boise in fourth quarter 2013, we reported our results in one reportable segment. After the acquisition, we began reporting our business in three reportable segments: Packaging, Paper, and Corporate and Other. These segments represent distinct businesses that we manage separately because of differing products and services. For more information, see Note 19, Segment Information, of the Notes to Consolidated Financial Statements in our 2013 Form 10-K which we plan to file on or about February 28, 2014.

(3) Segment income excluding special items, earnings before interest, income taxes, and depreciation, amortization, and depletion (EBITDA), and EBITDA excluding special items are non-GAAP financial measures. We present these measures because they provide a means to evaluate the performance of our segments and our company on an ongoing basis using the same measures that are used by our management and because these measures are frequently used by investors and other interested parties in the evaluation of companies and the performance of their segments. The tables included in "Reconciliation of Non-GAAP Financial Measures" reconcile the non-GAAP measures with the most directly comparable GAAP measures. Any analysis of non-GAAP financial measures should be done only in conjunction with results presented in accordance with GAAP. The non-GAAP measures are not intended to be substitutes for GAAP financial measures and should not be used as such.

(1) On October 25, 2013, we acquired Boise Inc. (Boise). The 2013 consolidated earnings results include Boise for the period of October 25 through December 31, 2013.

(2) Prior to the acquisition of Boise in fourth quarter 2013, we reported our results in one reportable segment. After the acquisition, we began reporting our business in three reportable segments: Packaging, Paper, and Corporate and Other. These segments represent distinct businesses that we manage separately because of differing products and services. For more information, see Note 19, Segment Information, of the Notes to Consolidated Financial Statements in our 2013 Form 10-K which we plan to file on or about February 28, 2014.

(3) Segment income excluding special items is a non-GAAP financial measure. We present this measure because it provides a means to evaluate the performance of our segments and our company on an ongoing basis using the same measure that is used by our management and because this measure is frequently used by investors and other interested parties in the evaluation of companies and the performance of their segments. The tables included in "Reconciliation of Non-GAAP Financial Measures" reconcile the non-GAAP measure with the most directly comparable GAAP measure. Any analysis of non-GAAP financial measures should be done only in conjunction with results presented in accordance with GAAP. The non-GAAP measure is not intended to be a substitute for GAAP financial measures and should not be used as such.

(1) Net income and earnings per share excluding special items are non-GAAP financial measures. The after-tax effect of special items are presented because they provide a means to evaluate the performance of our company on an ongoing basis using the same measures that are used by our management and because these measures are frequently used by investors and other interested parties in the evaluation of companies and their performance. Any analysis of non-GAAP financial measures should be done only in conjunction with results presented in accordance with GAAP. The non-GAAP measures are not intended to be substitutes for GAAP financial measures and should not be used as such.

(2) On October 25, 2013, we acquired Boise, Inc. (Boise). The 2013 results include Boise for the period of October 25 through December 31, 2013.

(3) Special items are tax-effected at a combined federal and state income tax rate in effect for the period the special items were recorded. The alternative energy tax credits are the release of unrecognized tax benefit reserves. For more information related to these items, see the footnotes to the Consolidated Earnings Results on page one and our 2013 Form 10-K which we plan to file on or about February 28, 2014.

EBITDA represents income before interest (interest expense and interest income), income taxes, and depreciation, amortization, and depletion. The following table reconciles net income to EBITDA and EBITDA to EBITDA excluding special items:

(1) EBITDA and EBITDA, excluding special items, are non-GAAP financial measures. We present these measures because they provide a means to evaluate the performance of our segments and our company on an ongoing basis using the same measures that are used by our management and because these measures are frequently used by investors and other interested parties in the evaluation of companies and the performance of their segments. For each non-GAAP financial measure, we provide a reconciliation to the most directly comparable financial measure presented in accordance with GAAP. These measures may differ from similarly captioned measures of other companies. Any analysis of non-GAAP financial measures should be done in conjunction with results presented in accordance with GAAP. The non-GAAP measures are not intended to be substitutes for GAAP financial measures and should not be used as such.

(1) EBITDA and EBITDA, excluding special items, are non-GAAP financial measures. We present these measures because they provide a means to evaluate the performance of our segments and our company on an ongoing basis using the same measures that are used by our management and because these measures are frequently used by investors and other interested parties in the evaluation of companies and the performance of their segments. For each non-GAAP financial measure, we provide a reconciliation to the most directly comparable financial measure presented in accordance with GAAP. These measures may differ from similarly captioned measures of other companies. Any analysis of non-GAAP financial measures should be done in conjunction with results presented in accordance with GAAP. The non-GAAP measures are not intended to be substitutes for GAAP financial measures and should not be used as such.